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String literals should be quoted by single quotation marks.

https://druid.apache.org/docs/latest/misc/math-expr.html

Ah a silly mistake. Thank you

Did it end up working for you with that change? (Just curious)

@Gian Merlino pardon my lateness - yes it worked like a charm! I'm using it to label the different sorts of events that are all submitted into the same table

good to know! 🎉